Chill-mold.



Patented May 8, I900. W. A. COCHBAN.

C H I L L M O L D (Application filed July 3, 1899.)

2 Sheets-Shaat l.

(No Model.)

M Jlllon cys m: warns versus ca, wmoumo. WASHINGTON D- No. 649,044.Patented may 8, I900. W. A. COCHRAN.

CHILL MOLD.

(Application filed July 3, 1899.)

2 Sheets-Shoat 2 (No Model.)

WZZIS07Z 1) 0 c 1310 r NITED STATES ATNT CHILL- MOLD.

SPECIFIGATION forming part Of Letters Patent NO. 649 044, dated May 8,1900.

Application filed July 3,1899. Serial N0. 722,710. (No model.)

To all whom it may concern.-

Be it known that LWILLIsON A. CocnRAN,a citizen of the UnitedStates,residing at Apollo, in the county of Armstrong and State ofPennsylvania, have invented a new and useful Chill-Mold, of which thefollowing is a specification.

My invention relates to improvements in chill-molds especially adaptedfor the casting of chilled rolls for metal-working, such rolls havingeither plain or grooved surfaces, although the improved mold is welladaptcd to casting other articles than rolls, which articles arerequired to have a chilled surface.

The object of the invention is to provide a simple and substantialconstruction of chillmold arranged to permit of the ready expansion andcontraction of the metal during the pouring operation andsolidification, respectively, such improved mold adapted to move inwardin order to follow the contraction of the solidifying metal and tomaintain such relation to the casting as to insure practically a uniformdepth of chill at all points of the chilled surface.

lVith this end in view the invention in its generic aspect consists of achill-mold cored to provide a plurality of longitudinal passagesarranged in series around the mold-cavity, each cored passage having aningress-port and an egress-port at its respective ends for the admissionand escape of the fluid required for heating and cooling the mold.

The invent-ion further consists of a chillmold constructed of aplurality of complemental sections assembled in alined relation to forma mold-cavity and said sections con: fined closely in yieldable relationfor expansion and contraction thereof, each mold-section having oneormore circulation-passages with proper ports at the respective endsthereofi'or the ingress and egress of a circulating fluid.

The invention further consists in the novel construction andarrangements of parts,which will be hereinafter more fully described andclaimed.

To enable others to understand the invention, I have illustrateddifferent embodiments thereof in the accompanying drawings, formingapart of this specification, and in which- Figure 1 is a verticalsectional elevation of a complete apparatus having the improvedchill-mold assembled in operative relation to the various parts of suchapparatus. Fig. 2 is a horizontal sectional plan view through theimproved chill-mold, the plane of the section being indicated by thedotted line 2 2 of Fig. 1. Fig. 3 is a vertical section through anotherembodiment of tho chill-mold, and Fig. 4 is a horizontal section on theline 4 4 of Fig. 3. Figs. 5 and G are vertical and horizontal sectionsof another embodiment of the improved chill-mold, illustrating adifferent means for holding the complemental sections in properrelation, the plane of section of Fig. 6 being indicated by the line 6 6of Fig. 5. Figs. 7 and 8 are vertical and horizontal sections of stillanother form of the chill-mold, the same representing a singlepiececored mold having a plurality of longitudinal circulating-passages, theplane of section of Fig .8 being indicated by the dotted line 8 8 ofFig. 7.

The same reference-numerals are used to indicate like and correspondingparts in each of the several figures of the drawings.

In order that others may understand the application of my improvedchill-mold, I have illustrated the preferred embodiment thereof inoperative relation to an ordinary casting apparatus by Fig. 1 of thedrawings, referring more particularly to which the numeral 10 indicatesthe bottom or drag, which contains a sand or loam filling 11, formingthe bottom neck-wabble and a portion of the runner-gate. With thisbottom or drag communicates the runner-elbow 12, and the runnerspout 13is coupled to this elbow, said spout having the ordinary runner box 14.The members of a divided flask are indicated at 15 16, said flask havinga sand or loam filling 17, forming the top neck-wabble and sinkhead.

The preferred form of the improved chillmold is indicated by the numeral18 in Figs. 1 and 2 of the drawings, said chill-mold occu pyin g theordinary relation to the bottom 10 and the flask 15 16 in Fig. 1. Thechillclc.

number of these segmental complemental members, which are adapted to beassembled together in abutting relation, as shown by Fig. 2, to producea complete circular moldcavity, and these abutting complemental membersare joined or confined together by any suitable means in order to holdthem in their proper assembled relation to form the complete mold. Eachsegmental member 19 of the mold has closed ends 20, the same beingdisposed radially to the axis of the complete mold in order that themembers may meetor abut throughout the width of the end faces. Eachsection is furthermore provided with radial flanges 21 22, which areformed integral therewith, said flanges being arranged at or near therespective ends of the section and extending the full length thereof. Inthe embodiment of the invention shown by Fig. 2 the longitudinal radialflanges 21 22 are disposed within the planes of the closed ends 20 ofthe sections, and on the assemblage of these sections to form the moldthe end faces 20 of said sections abut on lines radial to the axis ofthe mold, while the flanges 21 22 on adjacent sections or members 19 arespaced in parallel relation, such spaces extending the full length ofthe mold and adapted to receive a suitable filling, such as sand orloam,which fillings serve to close the joints between the mold-sectionsfor the exclusion of air from the metal contained in the mold-cavity.Each section of the mold is united to adjacent moldsections by a seriesof bolts 23, which pass through suitable openings provided in theparallel flanges 21 22, and in the type of mold shown by Fig. 2 eachbolt is equipped with a pair of nuts 24, one of which n are is screwedon the bolt to bear against a flange on one moldsection. The other nutof the pair on each bolt occupies a spaced relation to one flange on theadjacent mold-section, thus permitting a coiled spring 25 to be placedon the bolt between said spaced nut and the flange of the mold-section.It will be noted that the plurality of complemental sections are united.together at numerous points by bolts which are equipped with springsthat tend normally to force the mold-sections into close abuttingrelation but these mold-sections are adapted to be expanded by admittingthereto a heated fluid, such as steam, or they are contracted bysupplying to the heated mold a cooling medium, such as cold water,whereby the mold may contract to closely conform to the metallic castingduring the solidification thereof in order to give to the casting auniform depth of chilled surface throughout the entire area thereofexposed to contact with the mold. For the circulation of the heatableand cooling medium I construct each sectional member of the mold withone or a plurality of passages 26, which are cored out during theprocess of casting or making the mold-section. In Fig. 2 of the drawingseach section or member of the mold is represented as having twocirculation-passages, which are separated or divided by an interveningwall, said passages extending nearly the full length of the moldsection.Each passage in said mold-section has ports for the ingress and egressof the circulation fluid, the ingress-port 27 being preferably locatedat the lower extremity of the longitudinal passage 26, while theegress-port 28 is at the upper extremity of said longitudinal passage.The heating and cooling fluids are to be supplied to the passages 26after the mold shall have been assembled properly with respect to thebottom or drag and to the flask, and to provide for the supply and exitof the fluid to the mold the ports 27 28 open through the vertical faceof the mold instead of through the upper-and lower extremities of themoldsections, whereby the ports lie radially and horizontally to thevertical axis of the moldcavity. Anysuitable appliance may be adoptedfor supplying the fluid to and conveying the same from the passages 26of the chillmold; but as this appliance constitutes no part of thepresent invention I have not con sidered it necessary to illustrate ordescribe the same.

Another feature of my improved sectional chill-mold consists in theprovision of means by which the complemental members of the sectionshave interlocking connection along the radial meeting faces thereof,such interlocking joints tending to preserve the alinement of themold-sections during the operation of assembling the mold with respectto the casting apparatus. Each member or section 19 is provided in oneclosed face 20 with a longitudinal rib 29, arranged midway the depth ofthe face and protruding a proper distance therefrom, while the otherradial face 20 of said section or member has a longitudinal groove 30.The members or sec tions of the mold are placed in position for theclosed radial faces 20 thereof to abut one against the other and for therib 29 of one section to fit in the groove 30 of an adjacent section;but it is necessary to slip the final sectional member endwise intoplace to fill the gap between the contiguous sections, thus connectingall the sections by interlocking joints. After the mold sections ormembers shall have been properly brought together the bolts 23 may befitted in the flanges, the springs 25 placed in position, and the nuts24: screwed on the bolts to compress the springs and assist the bolts inholding the mold sections or members 19 in position to form a completecircular mold-cavity.

In the embodiment of the mold shown by Figs. 3 and 4 it is composed of aseries or plurality of cored sections each having a single longitudinalpassage 26, provided with the ingress and egress ports at its oppositeends and adapted to have interlocking connect-ion along its verticalfaces with adjacent sections;

but the mold-sections themselves are not flanged, as in Figs. 1 and 2,because I have represented an equivalent clamping means for the flangesand boltsfor holding the moldsections in their alined positions to forma complete circular mold-cavity. This locking means consists of a numberof annular hands, a series of three of such bands being shown by Fig. 3at 31 32 33, arranged to closely circumscribe the sectional mold atdifferent points. Each circumscribing-band consists, preferably, of anumber of sections equal in length to the width of the mold-sections andprovided with radial flanges 34, said flanges on the band-sectionsarranged to meet and abut in the plane of the abutting spaces of themold-sections, (see Fig. 4,) whereby the joints between the sections ofthe bands are coincident with the joints of the mold-sections. The bolts35 pass through the flanges of the band-sections, each bolt having a nut36 and a coiled spring 37. The circumscribing sectional bands have theirmembers held yieldably together for the purpose of closely holding thecomplemental members of the sectional mold, and these sectionalspringcontrolledbands permit the members of the mold to expand andcontract, so that the mold will closely follow the contour of thecasting during solidification thereof.

The chill-mold embodying the principles of this invention and shown byFigs. 5 and 6 of the drawings consists of sections or members of a lessnumber than the molds of Figs.

2 and 4:, the mold of Fig. 6 comprising quadrantal sections each havinga plurality of cored passages 26, each m old-section being shown by Fig.6 as having a series of three passages separated by interveningbridge-walls and each passage having the ingress and egress ports 27 28.The quadrantal sections abut one against the other and are united by theinterlocking joints; but in lieu of the spring-actuated bolts I haveshown the moldsections as having the radial longitudinal flanges 38,adapted to meet or abut laterally one against the other in pairs, suchflanges being apertured for the reception of the fastening-bolts 39.

The chill-mold illustrated by Figs. 7 and 8 is shown as cast in a singlepiece of metal, the mold being designated in its entirety by the numeral40. This mold has a continuous series of independentcirculation-passages 41 cored therein during the operation of castingthe mold, and each circulation-passage has the ports openinghorizontally through the cylindrical surface of the mold for the ingressand egress of the heating or cooling fluid.

In each of the molds herein shown and as different embodiments of thisinvention I prefer to employ the trunnions 42, located atdiametrically-opposite points, such trunnions adapted for the receptionof means by which the mold may be conveniently handled.

In the end faces of the mold are the cavities 43, adapted toreceiveflanged ends of the bottom or drag 10, and the flask-section 15,as shown by Fig. 1, for the purpose of making a close joint between eachpart or element with which the mold engages.

After the mold is properly fitted to the bottom or drag and the flask aheating medium, such as steam, is admitted by the ports 27 to circulatethrough the passages 26 and escape by the ports 28, such fluid heatingthe mold up to the required temperature. The fluid metal may now be runinto the apparatus through the runway and gate to fill the mold-cavity.Cold water may be admitted to the circulation-passages for contractingthe mold during the operation of solidifying the casting, and the moldis thus caused to closely conform and follow the solidifying casting inorder to impart a uniform chill to all surfaces of the casting exposedto contact to the mold.

Changes may be made in the form and proportion ofsome of the parts whiletheir essential features are retained and the spirit of the inventionembodied. Hence I do not desire to be limited to the precise form of allthe parts as shown, reserving the right to vary therefrom.

Having thus described the invention, what I claim is 1. An annularchill-mold comprising a series of segmental complemental membersassembled into abutting relation on lines radial to the axis of themold-cavity produced by the members, each member having a longitudinalcirc ulation-passage which terminates in ports arranged to open throughthe external lateral face of the section, and means for confining themold-sections yieldablyin their abutting relation, substantially asdescribed.

2. An annular chill-mold comprising a plurality of segmental complemental hollow sections, assembled into abutting relation on linesradial to the axis of the mold-cavity, and said sections coupled byinterlocking joints at their abutting faces, the chamber in eachmold-section forming a longitudinal circulating-passage which has portsopening through the lateral external face of the section, and means foryieldably holding the sections in place, substantially as described.

3. An annular chill-mold comprising a plurality of complemental hollowsections assembled into abutting relation on lines radial to the mold-cavity, interlocking ribs and grooves in the abutting faces of themoldsections, circulation-passages in said moldsections and having portswhich open through the external faces thereof, and clamping devices forholding the moldsections in yieldable abutting relation, substantiallyas described.

t. A chill-mold comprising a series of complemental members assembledinto abutting relation on lines radial to the axis of the moldcavity,and spring-controlled clamping devices connected with the mold membersto hold them closely together, substantially as described.

5. A chill-mold comprising a series of complemental members each havingpassages and assembled in abutting relation 011 lines radial to themold-cavity, bolts connecting the mold members together, and springsfitted to said bolts for the latter to yield to the expansion orcontraction of the mold, substantially as described.

5 6. A chill-mold comprising a series of complemental members eachhaving passages and assembled into abutting relation, sectional bandsarranged to circnmscribe the sectional mold, and bolts provided withtension-springs IO and connecting the members of the sectional bands,the joints between the sections of each band lying coincident with thejoints between the mold-sections.

In testimony that I claim the foregoing as my own I have hereto afiixedmy signature in 15 the presence of two witnesses.

WVILLISON A. COOHRAN.

Vitnesses:

J. Ross OoLHoUN, THEODORE DALTON.

